CN107399888B - Method for recovering aluminum in sludge of aluminum profile plant - Google Patents
Method for recovering aluminum in sludge of aluminum profile plant Download PDFInfo
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- CN107399888B CN107399888B CN201710549960.7A CN201710549960A CN107399888B CN 107399888 B CN107399888 B CN 107399888B CN 201710549960 A CN201710549960 A CN 201710549960A CN 107399888 B CN107399888 B CN 107399888B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/34—Preparation of aluminium hydroxide by precipitation from solutions containing aluminium salts
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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Abstract
The invention discloses a method for recovering aluminum from sludge in an aluminum profile factory, which comprises the steps of sludge crushing, waste residue acidolysis, multiple filtration, impurity precipitation, washing, drying and the like, the recovery rate of aluminum in sludge is improved, and filter residues generated in the recovery process can be used for preparing bricks, cement and the like for the building material industry, so that the utilization rate of sludge is further improved. The wastewater generated in the process can meet the standard of reclaimed water reuse or can be discharged after being slightly treated, and has the advantages of energy conservation and environmental protection. The method has simple process steps, realizes resource recycling, reduces the operation cost of enterprises, solves the problem of environmental pollution caused by disordered stacking or landfill of sludge in aluminum profile factories, and obtains remarkable economic and ecological effects.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a method for recovering aluminum in sludge of an aluminum profile factory.
Background
In the existing large-scale aluminum profile processing factory, the concentration of aluminum ions in the anodic oxidation waste liquid reaches 15-20 g/L and far exceeds the optimal control concentration by 3-8 g/L. In the practical production, the increase of the aluminum ion concentration affects the quality of the oxide film and increases the oxidation energy consumption, so aluminum profile manufacturers mostly adopt a groove-pouring method, that is, a part of groove liquid is poured to reduce the aluminum ion concentration. When 10 ten thousand tons of aluminum profiles are produced annually, the poured waste liquid reaches about 25000 tons, and the aluminum content is nearly 550 tons, so that the loss of useful substances, namely aluminum, is caused. Meanwhile, wastewater containing high-concentration acid is generated, the land occupation is large, and the pollution is serious.
In view of the severe environmental protection pressure in daily use, the existing enterprise processing methods are as follows: firstly, the aluminum is directly used as wastewater to enter a wastewater treatment center, so that the operation cost is increased, and the high-content aluminum in the wastewater cannot be recycled and causes economic and resource losses; in view of the inconvenience of placing and storing the acidic waste liquid and the harm to the environment, most enterprises adopt quicklime to neutralize the acid-containing anodic oxidation waste liquid, then squeeze and dry the acid-containing anodic oxidation waste liquid into neutral solid, and then bury the acid-containing anodic oxidation waste liquid. Although the solid is neutral, the influence of the acidity of the waste liquid on the environment is removed, but the treatment is temporary and permanent, and a large amount of aluminum resources are lost. Meanwhile, the operation cost is increased, so that the profit of enterprises is reduced, and the competitiveness of the enterprises is influenced. Aluminum profile processing enterprises adopting the second method for processing are more, particularly group-scale enterprises.
Chinese utility model patent 201320875536.9 discloses a scheme and system for neutralizing treatment of a pot mold waste liquid and an anodic oxidation waste liquid and then recovering aluminum ions, which comprises an alkaline system, an acidic system, a neutralizing system, a pneumatic stirring system, a filter pressing and a packaging system, thereby controlling the condition to generate aluminum hydroxide. Meanwhile, there are also relevant scholars studying the extraction of aluminum from acid-base wastewater by ion exchange. Although the scheme can generate aluminum hydroxide and aluminum oxide so as to extract aluminum with a certain content, the recovered aluminum has high impurity content and low purity due to complex impurities in the waste liquid, and the economic benefit generated by the method is low. For the recovery of aluminum from acid and alkali wastewater by using ion exchange technology, the mass transfer parameters, and the kinetics and thermodynamics are disadvantageous from the results of current research, and the recovery of aluminum by using the method is not economical.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for recovering aluminum from sludge in an aluminum section plant, so as to solve the problems of low purity and high impurity content of aluminum hydroxide prepared by recovering aluminum from aluminum-containing sludge in the aluminum section plant in the prior art, and reduce solid waste.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a recovery method of aluminum in sludge of an aluminum profile factory comprises the following steps:
(1) collecting waste sludge generated by an aluminum profile factory, and mashing the waste sludge into fluffy waste residues; if solid sludge with larger block hardness exists, a crusher can be used for crushing.
(2) Adding hydrochloric acid with the concentration of 1-3 mol/L into the waste residue for dissolving, wherein the addition amount of the hydrochloric acid needs to be ensured to be capable of immersing the waste residue, and then soaking for 20-40 min at normal temperature to form primary mixed liquid;
(3) filtering the primary mixed liquid formed in the step (2) by using a filter press, separating the primary mixed liquid into primary filter residue and primary filtrate after filtering, adding 25-35% hydrogen peroxide into the primary filtrate, standing and oxidizing for 2-5 min to form secondary mixed liquid, wherein the amount of the hydrogen peroxide per kilogram of sludge is 50-120 ml;
(4) adding 0.5mol/L ammonia water into the secondary mixed solution, and uniformly stirring to adjust the pH value of the mixed solution to 4.0 to form a tertiary mixed solution;
(5) filtering the tertiary mixed liquid formed in the step (4) by using a filter press, separating the filtered tertiary mixed liquid into secondary filter residue and secondary filtrate, introducing 3mol/L ammonia water into the filtered secondary filtrate, stirring and adjusting the pH value to 8.0-8.2, and standing and aging for 20-40 min to form a quaternary mixed liquid;
(6) filtering the fourth-time mixed liquid formed in the step (5) by using a filter press, separating the fourth-time mixed liquid into a filter cake and a third-time filtrate after filtering, repeatedly washing and filtering the filter cake, and drying the filter cake in a drying oven at 100-110 ℃ to obtain a target product aluminum hydroxide;
(7) introducing sufficient CO into the third filtrate formed in the step (6)2And carrying out filter pressing and drying to obtain the subsidiary product calcium carbonate, and treating the final filtrate by a purifying device to obtain reclaimed water for recycling. The filtrate obtained in the steps (5) and (6) can basically meet the standard of reclaimed water reuse.
Preferably, the primary filter residue formed in the step (3) is directly subjected to landfill treatment.
Preferably, the secondary filter residue formed in the step (5) is recycled.
Preferably, the hydrochloric acid is industrial hydrochloric acid, the hydrogen peroxide is industrial hydrogen peroxide, and the ammonia water is industrial ammonia water.
Preferably, in the step (3), the concentration of the hydrogen peroxide is 30%, and the dosage of the hydrogen peroxide per kilogram of sludge is 100 ml.
Preferably, the drying temperature of the oven in the step (6) is set to 106 ℃.
Preferably, the water content of the waste sludge collected in the step (1) is 60-70%.
Preferably, the standing and aging time in the step (5) is 30 min.
Preferably, the soaking time in the step (2) is 30min, and the concentration of the hydrochloric acid added in the step (2) is 3 mol/L.
Preferably, the filter press is a plate and frame filter press.
Compared with the prior art, the invention has the beneficial technical effects that: the method for recovering aluminum from sludge in the aluminum profile factory improves the recovery rate of aluminum in the sludge, and filter residues generated in the recovery process can be used for preparing building material products such as bricks, cement and the like, so that the utilization rate of the sludge is further improved. The waste water produced in the process can meet the requirement of reclaimed water recycling, or can be discharged after being slightly treated, and has the advantages of energy conservation and environmental protection. The method has simple process steps, realizes resource recycling, reduces the operation cost of enterprises, solves the problem of environmental pollution caused by disordered stacking or landfill of sludge in aluminum profile factories, and obtains remarkable economic and environmental benefits.
Drawings
FIG. 1 is a flow chart of the method for recovering aluminum from sludge in an aluminum profile factory.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the following embodiments.
Referring to fig. 1, the embodiment discloses a method for recovering aluminum from sludge in an aluminum profile plant, which comprises the following steps:
(1) collecting waste sludge with water content of 60-70% generated in an aluminum profile factory, and mashing the waste sludge into fluffy waste residues; if solid sludge with larger block hardness exists, a crusher can be adopted for crushing;
(2) adding hydrochloric acid with the concentration of 3mol/L into the waste residue for dissolving, wherein the addition amount of the hydrochloric acid needs to be ensured to be capable of immersing the waste residue, and then soaking for 30min at normal temperature to form primary mixed liquid;
(3) filtering the primary mixed liquid formed in the step (2) by using a plate and frame filter press, separating the primary mixed liquid into primary filter residue and primary filtrate after filtering, adding 30% hydrogen peroxide into the primary filtrate, standing and oxidizing for 2min to form secondary mixed liquid so as to obtain Fe in the primary filtrate2+Is oxidized into Fe3+Wherein the dosage of hydrogen peroxide per kilogram of sludge is 100 ml;
(4) adding 0.5mol/L ammonia water into the secondary mixed solution, and uniformly stirring to adjust the pH value of the mixed solution to 4.0 to form a tertiary mixed solution;
(5) filtering the tertiary mixed liquor formed in the step (4) by using a plate-and-frame filter press, so that Fe impurities in the oxidized mixed liquor are removed by precipitation in a system atmosphere with pH of 4, and further improving the purity of a finished product; filtering the third mixed solution, separating into a second filter residue and a second filtrate, introducing 3mol/L ammonia water into the filtered second filtrate, stirring and adjusting the pH value of the secondary filtrate to 8.0-8.2, and standing and aging for 30min to form a fourth mixed solution;
(6) filtering the fourth-time mixed liquor formed in the step (5) by using a filter press, separating the fourth-time mixed liquor into a filter cake and third-time filtrate after filtering, repeatedly washing and filtering the filter cake, and drying the filter cake in a drying oven at 106 ℃ to obtain a target product aluminum hydroxide; the number of the above-mentioned repeated washing is required to be 2 or more;
(7) introducing sufficient CO into the third filtrate formed in the step (6)2Through filter pressing and dryingThen the subsidiary product calcium carbonate is obtained, and the final filtrate is treated by a purifying device to obtain reclaimed water for recycling. The filtrate obtained in the steps (5) and (6) can basically meet the standard of reclaimed water reuse. The hydrochloric acid is industrial hydrochloric acid, the hydrogen peroxide is industrial hydrogen peroxide, and the ammonia water is industrial ammonia water. Preferably, the primary filter residue formed in the step (3) is directly subjected to landfill treatment. Preferably, the heavy metal content of the secondary filter residue formed in the step (5) is very little, and the secondary filter residue can be recycled.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The method for recovering aluminum from sludge in an aluminum profile factory is characterized by comprising the following steps:
(1) sludge crushing: collecting waste sludge generated by an aluminum profile factory, mashing the waste sludge into fluffy waste residues, and crushing solid sludge with large block hardness by using a crusher;
(2) dissolving waste residues: adding hydrochloric acid with the concentration of 1-3 mol/L into the waste residue for dissolving, immersing the waste residue, and then soaking at normal temperature for 20-40 min to form a primary mixed solution;
(3) primary filtration: filtering the primary mixed liquid formed in the step (2) by using a filter press, separating the primary mixed liquid into primary filter residue and primary filtrate after filtering, adding hydrogen peroxide with the concentration of 25-35% into the primary filtrate, standing and oxidizing for 2-5 min to form secondary mixed liquid, and adding Fe in the primary filtrate2+Is oxidized into Fe3+Wherein the dosage of hydrogen peroxide per kilogram of sludge is 50-120 ml;
(4) and (3) impurity precipitation: adding 0.5mol/L ammonia water into the secondary mixed solution, and uniformly stirring to adjust the pH value of the mixed solution to 4.0 to form a tertiary mixed solution;
(5) secondary filtration: filtering the tertiary mixed liquid formed in the step (4) by using a filter press, separating the filtered tertiary mixed liquid into secondary filter residue and secondary filtrate, introducing 3mol/L ammonia water into the filtered secondary filtrate, stirring and adjusting the pH value to 8.0-8.2, and standing and aging for 20-40 min to form a quaternary mixed liquid;
(6) washing and drying: filtering the fourth-time mixed liquid formed in the step (5) by using a filter press, separating the fourth-time mixed liquid into a filter cake and a third-time filtrate after filtering, repeatedly washing and filtering the filter cake, and drying the filter cake in a drying oven at 100-110 ℃ to obtain a target product aluminum hydroxide;
(7) filter pressing and purifying: introducing sufficient CO into the third filtrate formed in the step (6)2And carrying out filter pressing and drying to obtain the subsidiary product calcium carbonate, and treating the final filtrate by a purifying device to obtain reclaimed water for recycling.
2. A recycling method according to claim 1, characterized in that the primary filter residue formed in step (3) is directly disposed of in landfills.
3. The recycling method according to claim 2, characterized in that the secondary filter residue formed in step (5) is recycled.
4. The recycling method according to claim 1, wherein the hydrochloric acid is industrial hydrochloric acid, the hydrogen peroxide is industrial hydrogen peroxide, and the ammonia water is industrial ammonia water.
5. The recycling method according to claim 1, wherein the concentration of the hydrogen peroxide in the step (3) is 30%, and the amount of the hydrogen peroxide per kilogram of the sludge is 100 ml.
6. The recycling method according to claim 1, wherein the drying temperature of the oven in the step (6) is set to 106 ℃.
7. The recycling method according to claim 1, wherein the water content of the waste sludge collected in the step (1) is 60-70%.
8. The recycling method according to claim 1, wherein the standing aging time in the step (5) is 30 min.
9. The recovery method according to claim 1, wherein the soaking time in the step (2) is 30min, and the concentration of the hydrochloric acid added in the step (2) is 3 mol/L.
10. The recovery process according to any one of claims 1 to 9, wherein the filter press is a plate and frame filter press.
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| CN108439756A (en) * | 2018-03-23 | 2018-08-24 | 广东科达洁能股份有限公司 | A kind of Aluminum sludge treating system and method |
| CN108947027A (en) * | 2018-09-14 | 2018-12-07 | 兴发铝业（成都）有限公司 | Aluminum profile processing water pollution processing unit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104445212A (en) * | 2013-09-16 | 2015-03-25 | 贵阳铝镁设计研究院有限公司 | Method for processing fly ash used for circulating fluidized bed |
| EP2991935A1 (en) * | 2013-05-02 | 2016-03-09 | Easymining Sweden AB | Production of phosphate compounds from materials containing phosphorus and at least one of iron and aluminium |
| CN106186067A (en) * | 2016-07-06 | 2016-12-07 | 于佳湲 | A kind of method producing chromic oxide for raw material cleaning with chromite |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2991935A1 (en) * | 2013-05-02 | 2016-03-09 | Easymining Sweden AB | Production of phosphate compounds from materials containing phosphorus and at least one of iron and aluminium |
| CN104445212A (en) * | 2013-09-16 | 2015-03-25 | 贵阳铝镁设计研究院有限公司 | Method for processing fly ash used for circulating fluidized bed |
| CN106186067A (en) * | 2016-07-06 | 2016-12-07 | 于佳湲 | A kind of method producing chromic oxide for raw material cleaning with chromite |
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